Occasionally my screen goes blank, then stripes show up and the computer reboots, is this OK?

Occasionally my MacBook Pro screen goes blank, then a stripes screen appears followed by the computer rebooting.  Is this normal?

Does not sound like any kind of normal that I know of.
Sounds like a GPU issue.
Did you run the Apple Hardware Test  AHT  http://support.apple.com/kb/HT1509

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